Imparting robots with the grip of their human counterpart demands hands capable of carrying heavy objects as well as placing them carefully and gently.
Researchers at Saarland University and Bologna University (Professor Claudio Melchiorri) developed a twisted string actuator for robotic hands. Bologna University
Researchers at Saarland University developed a twisted string actuator for robotic hands that is capable of generating tremendous forces by means of a simple principle, while requiring little space. The catapults of the ancient Romans serve as a model for the artificial muscles.
The new miniature drive will be presented by the scientists at the Hannover Fair from April 19th to 24th . The Saarland research booth C44 is located in Hall 2.
Already the Romans used strings and tendon bundles to catapult enormous stones on their enemies. Back then the strings were also twisted about their own axis, setting free immense forces when released. The research group of Hartmut Janocha, professor of Process Automation at Saarland University, took this archetype for the modelling of robot hands, which should be able to grip powerfully yet gently.
"Humans move their hands using muscles in the forearm. That is why we were searching for a possibility to control and activate the fingers with the smallest possible components inside the forearm of the robot", said Professor Janocha, describing the challenge they faced. Using strings twisted by small, fast turning motors, the researchers can now generate high forces in a compact space.
"Extremely resilient polymer strings make it possible to hoist a load of five kilograms over 30 millimetres in less than a second, using an electric motor together with a string of 20 centimetres length", explained Professor Janocha. Each finger of the robotic hand developed by the research team around Professor Claudio Melchiorri at Bologna University, which like its human archetype is comprised of three phalanges, can be controlled delicately with the individual tendons. Compared with conventional solutions in which strings are wound around a spool, this new solution is significantly more compact. The miniature electric motors will be integrated within the fore-arm of the robot, making it even more similar to the human arm. "The miniature motors run at high speed and with a low torque of about 5 Newton-millimetres. The combination of compact motors with twisted strings can be advantageous in other applications", says Professor Janocha.
The research on robotic hands in Saarbrücken is part of the European funded project DEXMART, in which eight universities and research institutes from Germany, France, Italy and Great Britain participate. The goal of the project is to impart robots with specific properties so that they can assist persons in the household, in operating rooms or industrial settings. Starting in 2008, the European Union is investing 6.3 million Euro over four years in the research project.For more information, contact:
LZH optimizes laser-based CFRP reworking for the aircraft industry
24.11.2016 | Laser Zentrum Hannover e.V.
eldec generators CUSTOM LINE: Customized energy source for perfect induction heating
23.11.2016 | EMAG eldec Induction GmbH
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
07.12.2016 | Health and Medicine
07.12.2016 | Life Sciences
07.12.2016 | Health and Medicine